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Let's say person A inflicts harm on person B.

Person C inflicts harm on person A and says he did so because A inflicted harm on B.

Can person D inflict harm on person C with the same reasoning? If he can, is it wrong to inflict harm on anyone?

If it's not wrong, then is C justifiable in his approach in harming A? If it's wrong, are C and D both wrong?

Added parts :

Person B had done no harm to person A.

All of this events happen with only two of these people together at a given time. That is, person A and B are together, or person A and C are together, or person C and D are together. Not more than 2.